US896045A - Boiler tube-sheet. - Google Patents

Description

No.896,045. PATENTED AUG. 11,1908.

G. H. RHEUTAN. BOILER TUBE SHEET.

APPLICATION FILED JULY 22, 1907.

"r 'FTTFV UNITE STATES PATENT OFFICE.

GARRETT H. RHEUTAN, OF FITGHBURG, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ROBERT B. LINCOLN, OF WALTHAM, MASSACHUSETTS.

BOILER TUBE-SHEET.

Specification of Letters Patent.

Patented Aug. 11, 1908.

To all whom it may concern:

Be it known that I, GARRETT H. RHEUTAN, of Fitchburg, in the county of IVorcester and State of Massachusetts, have invented certain new and useful Improvements in Boiler Tube-Sheets, of which the following is a specification.

This invention relates to a boiler tube sheet of the character shown in Letters Pat: ent of the United States, No. 740,923, dated October 6, 1903. The tube sheet shown in the said patent is intended particularly for a boiler of the return-tubular fire-tube type, and is characterized by a truss crossing the sheet transversely, and "presented edgewise to the general plane of the sheet, the object of the truss being to strengthen the tube sheet, and render the employment of bracing by stays or other means unnecessary.

The present invention has for its object to still further increase the strength and stiffness of the tube sheet, and it consists in providing the truss above mentioned with transverse waves, which impart to the truss a sinuous form throughout substantially its entire length.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents an end elevation of a return-tubular boiler provided with a tube sheet embodying my invention. Fig. 2 represents a section on line 22 of Fig. 1.

In the drawings, 10 represents the shell of a return-tubular boiler, and 11 represents the fire-tubes having the usual location in the lower part of said shell, their ends being fixed in the perforations of the tube-sheet or head. Said head is constructed with a substantially-flat perforated lower ortion 13 whose holes receive the tube-en s, an outwardly bulged convex portion 14 above the flat portion 13 and occupying substantially the whole width of the tube-sheet, and a horizontal connecting shelf or truss 15 integral with the metal or substance of the portions 13 1 1, in other words, continuous with the web of the sheet and extending transversely across said sheet. The convex portion 14 has the natural shape of greatest resistance which it would assume if free to adjust itself to the pressure of the boiler,

and the shelf 15 forms a transverse truss presented edgewise to the general plane of the tube-sheet and to the direction of pressure from within the boiler. The effect of such construction is to so stiffen and strengthen the tube-sheet that the necessity for staying its upper portion is eliminated or reduced to a minimum. The head or tubesheet has a cylindrical flange 16 for securing it to the shell 10 with rivets 17.

The construction thus far described is identical with that shown in the above-mentioned Letters Patent, N o. 7 40,923.

In carrying out the present invention I provide the truss with a plurality of transverse waves, which are so formed and arranged as to give the truss a sinuous form throughout substantially its entire length. The crests of the waves extend crosswise of the truss, and each wave occupies the entire width of the truss. The effect of the sinuous form thus imparted to the truss, is to materially increase its strength and stiffness, and prevent the form of the angles resulting from the union of the truss with the portions of the sheet above and below it, from being changed by pressure exerted on the head. With a flat truss there is some liability of the weakening of the said angles by pulsating movements imparted to the truss and the adjacent parts of the tube sheet when the boiler is in use, particularly in large boilers such as those of the marine type. This liability is removed by imparting to the truss a sinuous form throughout substantially the entire length of the truss, as shown in Fig. 1.

I claim:

A tube sheet for fire-tube boilers having a truss crossing the sheet transversely and presented edgewise to the general plane of the sheet, the truss being provided with transverse waves which impart to it a sinuous form throughout substantially its entire length.

7 In testimony whereof I have afixed my signature, in presence of two witnesses.

GARRETT H. RHEUTAN. Witnesses:

ALvAH M. LEVY, ELMER O. ELLIOTT.

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